Aluminum alloy for vehicle body and preparation method thereof

An aluminum alloy and body technology, which is applied in the field of aluminum alloy composition design and heat treatment for body panels, can solve the problems of improving the hardening ability of the stamping and forming ability of the downstream automobile factory, reducing the hardening ability of the paint baking process, and restricting the application of the body, etc. Achieve low temperature rapid strengthening, improve wear and corrosion resistance, and high room temperature stability

Active Publication Date: 2019-09-20
SHANDONG NANSHAN ALUMINUM +3
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AI Technical Summary

Problems solved by technology

[0003] As the aluminum alloy sheet of the body cover, compared with the mature steel used in automobiles, there are still many problems to be solved in the performance of the aluminum alloy sheet, which also limits the application on the body
Especially in the process of storage and transportation in the warehouse after the solution treatment of the raw material factory, natural aging hardening will occur, which seriously affects the stamping ability of the downstream automobile factory and the improvement of the hardening ability after baking
For the adverse effects of natural aging, researchers and technicians have designed technical means including pre-aging treatment, pre-strain treatment, etc., all of which have a certain inhibitory effect, but all bring about a reduction in the hardening ability of the baking process.

Method used

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  • Aluminum alloy for vehicle body and preparation method thereof
  • Aluminum alloy for vehicle body and preparation method thereof
  • Aluminum alloy for vehicle body and preparation method thereof

Examples

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preparation example Construction

[0034] A method for preparing an aluminum alloy for a vehicle body, comprising:

[0035] S1. Adjustment of content and ratio of main alloying elements, addition of microalloying elements.

[0036] According to the calculation and analysis of thermodynamic balance, the alloy composition is designed, the aluminum alloy raw material is smelted into a billet, and the sample is analyzed to control the chemical composition of the billet. The main alloying elements include: Mg: 0.7-1.2%, Si: 0.4-0.8%, Cu: 0.2- 0.9%, Zn: 1.5-3.0%, Fe: ≤0.5%, microalloying elements include: Sn: 0.02-0.06%, In: 0.02-0.06%, matrix elements include Al: balance.

[0037] S2. Homogenization treatment.

[0038] The homogenization treatment in this embodiment is a two-stage homogenization treatment. Specifically, the two-stage homogenization treatment is carried out in a resistance furnace, and the billet is kept at a primary heating temperature of 480-520 ° C for 2-4 hours to realize the solidification proces...

Embodiment 1

[0056] This embodiment provides a method for preparing an aluminum alloy for a vehicle body, which includes:

[0057] (1) According to the calculation and analysis of thermodynamic equilibrium, the alloy composition is designed, the aluminum alloy raw material is smelted into a billet, and the sample is analyzed to control the chemical composition of the billet. The main alloying elements include: Mg: 0.8%, Si: 0.6%, Cu : 0.25%, Zn: 1.6%, Fe: 0.45%, Sn: 0.03, In: 0.03, and the balance of Al. Its as-cast structure is as figure 1 shown by figure 1 It can be seen that the grain boundary network AlFeSi crystal phase exists in the as-cast structure.

[0058] (2) Heat the billet at a heating rate of 2°C / s to the primary heating temperature of 510°C for 3 hours, and at a heating rate of 11°C / s to the secondary heating temperature of 570°C for 6 hours; after 510°C / 3h- After double-stage homogenization treatment at 570℃ / 6h, its metallographic structure is as follows: figure 2 As s...

Embodiment 2

[0063] This example provides a method for preparing an aluminum alloy for vehicle body, the design alloy composition Mg: 0.9%, Si: 0.8%, Cu: 0.3%, Zn: 1.8%, Fe: 0.3%, Sn: 0.025, In: 0.04 , and the balance of Al. Thermal processing and heat treatment process are all consistent with embodiment 1.

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Abstract

The invention provides an aluminum alloy for an automobile body and a preparing method of the aluminum alloy and relates to the technical field of component design and heat treatment of aluminum alloys used for covering parts of automobile bodies. The aluminum alloy for the automobile body comprises, by weight percent, 0.7%-1.2% of Mg, 0.4%-0.8% of Si, 0.2%-0.9% of Cu, 1.5%-3.0% of Zn, smaller than or equal to 0.5% of Fe, 0.02%-0.06% of Sn, 0.02%-0.06% of In and the balance Al. Due to the fact that chemical components are limited and optimized, the aluminum alloy for the automobile body has higher room temperature stability, and therefore the baking varnish capability of the downstream part of the aluminum alloy for the automobile body can be obviously improved. In addition, the preparingmethod of the aluminum alloy for the automobile body includes the step that an aluminum alloy raw material is smelted into a blank, and the chemical components of the blank are controlled to meet theabove requirement. By means of the preparing method, the production process is shortened, the cost is reduced, and the preparing method is suitable for industrial application and popularization.

Description

technical field [0001] The invention relates to the technical field of composition design and heat treatment of an aluminum alloy for a vehicle body cover, in particular to an aluminum alloy for a vehicle body and a preparation method thereof. Background technique [0002] In recent years, while enjoying the convenience of life brought by the rapid development of science and technology, people are also facing the impact of global warming and energy crisis. This has made related industries put forward requirements for the automotive industry to reduce energy consumption, low-carbon environmental protection and improve efficiency. In the Chinese version of the "Industry 4.0" Plan - Made in China 2025 issued by the State Council, "energy saving and new energy vehicles" is proposed as a key development area. By 2025, the overall fuel consumption of new passenger cars will be reduced to 4L per 100 kilometers. about. Automobile lightweight has become one of the most effective me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/10C22C1/02C22F1/053
Inventor 程仁策李辉祝贞凤刘文静辛涛李铸铁史春丽张启东
Owner SHANDONG NANSHAN ALUMINUM
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